4-bromo-1-(bromomethyl)-2-methylbenzene

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:2.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1-Bromo-4-(bromomethyl)-3-methylbenzene (13.2 g, 50.1 mmol) is dissolved in DMF (65 mL). The reaction mixture is cooled to 0-5° C. and NaCN (3.66 g, 74.6 mmol) is added follow by water (8 mL). The reaction is stirred overnight at room temperature and water (170 mL) is added followed by NaHCO3 sat. (130 mL) and hexane/Et2O (2:1) (150 mL). The organic phase is separated and the aqueous phase extracted with hexane/Et2O (2:1) (3×150 mL). The combined organic phases are washed with water (170 mL), dried over MgSO4, filtered and concentrated under reduced pressure to provide the expected product 2-(4-bromo-2-methylphenyl)acetonitrile (9.76 g, 93%) as an orange oil. 1H NMR (300 MHz, CHLOROFORM-D): δ 7.40-7.32 (2H, m), 7.23 (2H, d, J=8.2 Hz), 3.61 (2H, s), 2.32 (3H, s). The organic phase is separated the aqueous phase extracted with hexane/Et2O (2:1) (3×150 mL) The combined organic phases are washed with water (170 mL) dried over MgSO4 filtered concentrated under reduced pressure

Conditions: temp:2.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (4-Bromo-2-methylphenyl)methanol (10.4 g, 51.6 mmol) is dissolved in anhydrous CH2Cl2 (150 mL) and CBr4 (18.8 g, 56.8 mmol) added. The reaction mixture is cooled to 0-5° C. and PPh3 (14.9 g, 56.8 mmol) is added. The reaction mixture is stirred overnight then hexane/EtOAc (9:1) (250 mL) is added with vigorous stirring. The triphenylphosphine oxide that forms during the reaction is filtered off and the filtrates are concentrated in vacuo. The resulting oil is purified on a silica gel pad with hexane/EtOAc (8:2). The solvent are removed on a rotary evaporator and the bromoform is removed by vacuum distillation (15 mm Hg, bp: 40-50° C.) to provide the expected product 1-Bromo-4-(bromomethyl)-3-methylbenzene (13.23 g, 97%) as a yellow oil. 1H NMR (300 MHz, CHLOROFORM-D): δ 7.37-7.27 (2H, m), 7.17 (1H, d, J=8.1 Hz), 4.45 (2H, s), 2.39 (3H, s). is filtered off the filtrates are concentrated in vacuo The resulting oil is purified on a silica gel pad with hexane/EtOAc (8:2) The solvent are removed on a rotary evaporator the bromoform is removed by vacuum distillation (15 mm Hg, bp: 40-50° C.)

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of imidazole (58.0 mg, 0.86 mmol) in 3 mL DMF was treated with NaH (20.0 mg, 0.86 mmol) and heated to 90° C. After 1 h a solution of 4-bromo-1-bromomethyl-2-methyl-benzene (Intermediate 138, 190.0 mg, 0.72 mmol) in 3 mL DMF was added and stirring at 90° C. continued for I hour. The solution was cooled to room temperature and concentrated under reduced pressure. The title compound, 160.0 mg (88%) was isolated by column chromatography (5% MeOH-EtOAc) as a colorless solid. The solution was cooled to room temperature concentrated under reduced pressure

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of (4-bromo-2-methyl-phenyl)-methanol (Intermediate 133, 319.0 mg, 1.58 mmol) and triphenylphosphine (466.0 mg, 1.74 mmol) in 5 mL CH2Cl2 was cooled to 0° C. and N-bromosuccinimide (309.0 mg, 1.74 mmol) was added in 5 portions over 20 minutes. The solution was warmed to 25° C. and stirred for 17 hours. The reaction was quenched by the addition of dilute aqueous NaHCO3. The resulting mixture was extracted with Et2O and the combined organic layers were washed with H2O and saturated aqueous NaCl before being dried (Na2SO4) and concentrated under reduced pressure. The title compound, 350.0 mg (84%), was isolated by column chromatography (2-3% EtOAc-hexanes) as a colorless oil. The reaction was quenched by the addition of dilute aqueous NaHCO3 The resulting mixture was extracted with Et2O the combined organic layers were washed with H2O and saturated aqueous NaCl before being dried (Na2SO4) concentrated under reduced pressure

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of imidazole (58.0 mg, 0.86 mmol) in 3 mL DMF was treated with NaH (20.0 mg, 0.86 mmol) and heated to 90° C. After 1 h a solution of 4-bromo-1-bromomethyl-2-methyl-benzene (Intermediate 138, 190.0 mg, 0.72 mmol) in 3 mL DMF was added and stirring at 90° C. continued for 1 hour. The solution was cooled to room temperature and concentrated under reduced pressure. The title compound, 160.0 mg (88%) was isolated by column chromatography (5% MeOH-EtOAc) as a colorless solid. The solution was cooled to room temperature concentrated under reduced pressure

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of (4-bromo-2-methyl-phenyl)-methanol (Intermediate 133, 319.0 mg, 1.58 mmol) and triphenylphosphine (466.0 mg, 1.74 mmol) in 5 mL CH2Cl2 was cooled to 0° C. and N-bromosuccinimide (309.0 mg, 1.74 mmol) was added in 5 portions over 20 minutes. The solution was warmed to 25° C. and stirred for 17 hours. The reaction was quenched by the addition of dilute aqueous NaHCO3. The resulting mixture was extracted with Et2O and the combined organic layers were washed with H2O and saturated aqueous NaCl before being dried (Na2SO4) and concentrated under reduced pressure. The title compound, 350.0 mg (84%), was isolated by column chromatography (2-3% EtOAc-hexanes) as a colorless oil. The reaction was quenched by the addition of dilute aqueous NaHCO3 The resulting mixture was extracted with Et2O the combined organic layers were washed with H2O and saturated aqueous NaCl before being dried (Na2SO4) concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir: